package com.springmvc.controller;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Date;
import java.util.Iterator;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.io.filefilter.MagicNumberFileFilter;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.multipart.MultipartHttpServletRequest;
import org.springframework.web.multipart.commons.CommonsMultipartFile;
import org.springframework.web.multipart.commons.CommonsMultipartResolver;

@Controller
public class FileUpload {
	
public String addUser(@RequestParam("file") CommonsMultipartFile[] files,HttpServletRequest request){
		
		for(int i = 0;i<files.length;i++){
			System.out.println("fileName---------->" + files[i].getOriginalFilename());
		
			if(!files[i].isEmpty()){
				int pre = (int) System.currentTimeMillis();
				try {
					//拿到输出流，同时重命名上传的文件
					FileOutputStream os = new FileOutputStream("H:/" + new Date().getTime() + files[i].getOriginalFilename());
					//拿到上传文件的输入流
					FileInputStream in = (FileInputStream) files[i].getInputStream();
					
					//以写字节的方式写文件
					int b = 0;
					while((b=in.read()) != -1){
						os.write(b);
					}
					os.flush();
					os.close();
					in.close();
					int finaltime = (int) System.currentTimeMillis();
					System.out.println(finaltime - pre);
					
				} catch (Exception e) {
					e.printStackTrace();
					System.out.println("上传出错");
				}
		}
		}
		return "/success";
	}
	
	
	@RequestMapping("/upload2"	)
	public String upload2(HttpServletRequest request,HttpServletResponse response) throws IllegalStateException, IOException {
		//创建一个通用的多部分解析器
		CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver(request.getSession().getServletContext());
		//判断 request 是否有文件上传,即多部分请求
		if(multipartResolver.isMultipart(request)){
			//转换成多部分request  
			MultipartHttpServletRequest multiRequest = (MultipartHttpServletRequest)request;
			//取得request中的所有文件名
			Iterator<String> iter = multiRequest.getFileNames();
			while(iter.hasNext()){
				//记录上传过程起始时的时间，用来计算上传时间
				int pre = (int) System.currentTimeMillis();
				//取得上传文件
				MultipartFile file = multiRequest.getFile(iter.next());
				if(file != null){
					//取得当前上传文件的文件名称
					String myFileName = file.getOriginalFilename();
					//如果名称不为“”,说明该文件存在，否则说明该文件不存在
					if(myFileName.trim() !=""){
						System.out.println(myFileName);
						//重命名上传后的文件名
						String fileName = "demoUpload" + file.getOriginalFilename();
						//定义上传路径
						String path = "H:/" + fileName;
						File localFile = new File(path);
						file.transferTo(localFile);
					}
				}
				//记录上传该文件后的时间
				int finaltime = (int) System.currentTimeMillis();
				System.out.println(finaltime - pre);
			}
			
		}
		return "/success";
	}
	
	@RequestMapping("/toUpload"	) 
	public String toUpload() {
		
		return "/upload";
	}
	
}
